2 This file is part of GNUnet.
3 (C) 2009 Christian Grothoff (and other contributing authors)
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6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 2, or (at your
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
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17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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22 * @file core/gnunet-service-core.c
23 * @brief high-level P2P messaging
24 * @author Christian Grothoff
26 * Considerations for later:
27 * - check that hostkey used by transport (for HELLOs) is the
28 * same as the hostkey that we are using!
29 * - add code to send PINGs if we are about to time-out otherwise
30 * - optimize lookup (many O(n) list traversals
31 * could ideally be changed to O(1) hash map lookups)
34 #include "gnunet_constants.h"
35 #include "gnunet_util_lib.h"
36 #include "gnunet_hello_lib.h"
37 #include "gnunet_peerinfo_service.h"
38 #include "gnunet_protocols.h"
39 #include "gnunet_signatures.h"
40 #include "gnunet_transport_service.h"
44 #define DEBUG_HANDSHAKE GNUNET_NO
46 #define DEBUG_CORE_QUOTA GNUNET_YES
49 * Receive and send buffer windows grow over time. For
50 * how long can 'unused' bandwidth accumulate before we
51 * need to cap it? (specified in seconds).
53 #define MAX_WINDOW_TIME_S (5 * 60)
56 * How many messages do we queue up at most for optional
57 * notifications to a client? (this can cause notifications
58 * about outgoing messages to be dropped).
60 #define MAX_NOTIFY_QUEUE 16
63 * Minimum bandwidth (out) to assign to any connected peer.
64 * Should be rather low; values larger than DEFAULT_BW_IN_OUT make no
67 #define MIN_BANDWIDTH_PER_PEER GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT
70 * After how much time past the "official" expiration time do
71 * we discard messages? Should not be zero since we may
72 * intentionally defer transmission until close to the deadline
73 * and then may be slightly past the deadline due to inaccuracy
74 * in sleep and our own CPU consumption.
76 #define PAST_EXPIRATION_DISCARD_TIME GNUNET_TIME_UNIT_SECONDS
79 * How long do we delay messages to get larger packet sizes (CORKing)?
81 #define MAX_CORK_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
84 * What is the maximum delay for a SET_KEY message?
86 #define MAX_SET_KEY_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
89 * What how long do we wait for SET_KEY confirmation initially?
91 #define INITIAL_SET_KEY_RETRY_FREQUENCY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 3)
94 * What is the maximum delay for a PING message?
96 #define MAX_PING_DELAY GNUNET_TIME_relative_multiply (MAX_SET_KEY_DELAY, 2)
99 * What is the maximum delay for a PONG message?
101 #define MAX_PONG_DELAY GNUNET_TIME_relative_multiply (MAX_PING_DELAY, 2)
104 * How often do we recalculate bandwidth quotas?
106 #define QUOTA_UPDATE_FREQUENCY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 5)
109 * What is the priority for a SET_KEY message?
111 #define SET_KEY_PRIORITY 0xFFFFFF
114 * What is the priority for a PING message?
116 #define PING_PRIORITY 0xFFFFFF
119 * What is the priority for a PONG message?
121 #define PONG_PRIORITY 0xFFFFFF
124 * How many messages do we queue per peer at most? Must be at
127 #define MAX_PEER_QUEUE_SIZE 16
130 * How many non-mandatory messages do we queue per client at most?
132 #define MAX_CLIENT_QUEUE_SIZE 32
135 * What is the maximum age of a message for us to consider
136 * processing it? Note that this looks at the timestamp used
137 * by the other peer, so clock skew between machines does
138 * come into play here. So this should be picked high enough
139 * so that a little bit of clock skew does not prevent peers
140 * from connecting to us.
142 #define MAX_MESSAGE_AGE GNUNET_TIME_UNIT_DAYS
145 * What is the maximum size for encrypted messages? Note that this
146 * number imposes a clear limit on the maximum size of any message.
147 * Set to a value close to 64k but not so close that transports will
148 * have trouble with their headers.
150 #define MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
154 * State machine for our P2P encryption handshake. Everyone starts in
155 * "DOWN", if we receive the other peer's key (other peer initiated)
156 * we start in state RECEIVED (since we will immediately send our
157 * own); otherwise we start in SENT. If we get back a PONG from
158 * within either state, we move up to CONFIRMED (the PONG will always
159 * be sent back encrypted with the key we sent to the other peer).
161 enum PeerStateMachine
165 PEER_STATE_KEY_RECEIVED,
166 PEER_STATE_KEY_CONFIRMED
171 * Number of bytes (at the beginning) of "struct EncryptedMessage"
172 * that are NOT encrypted.
174 #define ENCRYPTED_HEADER_SIZE (sizeof(struct GNUNET_MessageHeader) + sizeof(uint32_t))
178 * Encapsulation for encrypted messages exchanged between
179 * peers. Followed by the actual encrypted data.
181 struct EncryptedMessage
184 * Message type is either CORE_ENCRYPTED_MESSAGE.
186 struct GNUNET_MessageHeader header;
189 * Random value used for IV generation. ENCRYPTED_HEADER_SIZE must
190 * be set to the offset of the *next* field.
192 uint32_t iv_seed GNUNET_PACKED;
195 * Hash of the plaintext (starting at 'sequence_number'), used to
196 * verify message integrity. Everything after this hash (including
197 * this hash itself) will be encrypted.
199 GNUNET_HashCode plaintext_hash;
202 * Sequence number, in network byte order. This field
203 * must be the first encrypted/decrypted field and the
204 * first byte that is hashed for the plaintext hash.
206 uint32_t sequence_number GNUNET_PACKED;
209 * Desired bandwidth (how much we should send to this peer / how
210 * much is the sender willing to receive)?
212 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
215 * Timestamp. Used to prevent reply of ancient messages
216 * (recent messages are caught with the sequence number).
218 struct GNUNET_TIME_AbsoluteNBO timestamp;
224 * We're sending an (encrypted) PING to the other peer to check if he
225 * can decrypt. The other peer should respond with a PONG with the
226 * same content, except this time encrypted with the receiver's key.
231 * Message type is CORE_PING.
233 struct GNUNET_MessageHeader header;
236 * Random number chosen to make reply harder.
238 uint32_t challenge GNUNET_PACKED;
241 * Intended target of the PING, used primarily to check
242 * that decryption actually worked.
244 struct GNUNET_PeerIdentity target;
250 * Response to a PING. Includes data from the original PING
251 * plus initial bandwidth quota information.
256 * Message type is CORE_PONG.
258 struct GNUNET_MessageHeader header;
261 * Random number proochosen to make reply harder. Must be
262 * first field after header (this is where we start to encrypt!).
264 uint32_t challenge GNUNET_PACKED;
269 uint32_t reserved GNUNET_PACKED;
272 * Desired bandwidth (how much we should send to this
273 * peer / how much is the sender willing to receive).
275 struct GNUNET_BANDWIDTH_Value32NBO inbound_bw_limit;
278 * Intended target of the PING, used primarily to check
279 * that decryption actually worked.
281 struct GNUNET_PeerIdentity target;
286 * Message transmitted to set (or update) a session key.
292 * Message type is either CORE_SET_KEY.
294 struct GNUNET_MessageHeader header;
297 * Status of the sender (should be in "enum PeerStateMachine"), nbo.
299 int32_t sender_status GNUNET_PACKED;
302 * Purpose of the signature, will be
303 * GNUNET_SIGNATURE_PURPOSE_SET_KEY.
305 struct GNUNET_CRYPTO_RsaSignaturePurpose purpose;
308 * At what time was this key created?
310 struct GNUNET_TIME_AbsoluteNBO creation_time;
313 * The encrypted session key.
315 struct GNUNET_CRYPTO_RsaEncryptedData encrypted_key;
318 * Who is the intended recipient?
320 struct GNUNET_PeerIdentity target;
323 * Signature of the stuff above (starting at purpose).
325 struct GNUNET_CRYPTO_RsaSignature signature;
331 * Message waiting for transmission. This struct
332 * is followed by the actual content of the message.
338 * We keep messages in a doubly linked list.
340 struct MessageEntry *next;
343 * We keep messages in a doubly linked list.
345 struct MessageEntry *prev;
348 * By when are we supposed to transmit this message?
350 struct GNUNET_TIME_Absolute deadline;
353 * By when are we supposed to transmit this message (after
356 struct GNUNET_TIME_Absolute slack_deadline;
359 * How important is this message to us?
361 unsigned int priority;
364 * How long is the message? (number of bytes following
365 * the "struct MessageEntry", but not including the
366 * size of "struct MessageEntry" itself!)
371 * Was this message selected for transmission in the
372 * current round? GNUNET_YES or GNUNET_NO.
377 * Did we give this message some slack (delayed sending) previously
378 * (and hence should not give it any more slack)? GNUNET_YES or
389 * We keep neighbours in a linked list (for now).
391 struct Neighbour *next;
394 * Unencrypted messages destined for this peer.
396 struct MessageEntry *messages;
399 * Head of the batched, encrypted message queue (already ordered,
400 * transmit starting with the head).
402 struct MessageEntry *encrypted_head;
405 * Tail of the batched, encrypted message queue (already ordered,
406 * append new messages to tail)
408 struct MessageEntry *encrypted_tail;
411 * Handle for pending requests for transmission to this peer
412 * with the transport service. NULL if no request is pending.
414 struct GNUNET_TRANSPORT_TransmitHandle *th;
417 * Public key of the neighbour, NULL if we don't have it yet.
419 struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key;
422 * We received a PING message before we got the "public_key"
423 * (or the SET_KEY). We keep it here until we have a key
424 * to decrypt it. NULL if no PING is pending.
426 struct PingMessage *pending_ping;
429 * We received a PONG message before we got the "public_key"
430 * (or the SET_KEY). We keep it here until we have a key
431 * to decrypt it. NULL if no PONG is pending.
433 struct PongMessage *pending_pong;
436 * Non-NULL if we are currently looking up HELLOs for this peer.
439 struct GNUNET_PEERINFO_IteratorContext *pitr;
442 * SetKeyMessage to transmit, NULL if we are not currently trying
445 struct SetKeyMessage *skm;
448 * Identity of the neighbour.
450 struct GNUNET_PeerIdentity peer;
453 * Key we use to encrypt our messages for the other peer
454 * (initialized by us when we do the handshake).
456 struct GNUNET_CRYPTO_AesSessionKey encrypt_key;
459 * Key we use to decrypt messages from the other peer
460 * (given to us by the other peer during the handshake).
462 struct GNUNET_CRYPTO_AesSessionKey decrypt_key;
465 * ID of task used for re-trying plaintext scheduling.
467 GNUNET_SCHEDULER_TaskIdentifier retry_plaintext_task;
470 * ID of task used for re-trying SET_KEY and PING message.
472 GNUNET_SCHEDULER_TaskIdentifier retry_set_key_task;
475 * ID of task used for updating bandwidth quota for this neighbour.
477 GNUNET_SCHEDULER_TaskIdentifier quota_update_task;
480 * ID of task used for cleaning up dead neighbour entries.
482 GNUNET_SCHEDULER_TaskIdentifier dead_clean_task;
485 * At what time did we generate our encryption key?
487 struct GNUNET_TIME_Absolute encrypt_key_created;
490 * At what time did the other peer generate the decryption key?
492 struct GNUNET_TIME_Absolute decrypt_key_created;
495 * At what time did we initially establish (as in, complete session
496 * key handshake) this connection? Should be zero if status != KEY_CONFIRMED.
498 struct GNUNET_TIME_Absolute time_established;
501 * At what time did we last receive an encrypted message from the
502 * other peer? Should be zero if status != KEY_CONFIRMED.
504 struct GNUNET_TIME_Absolute last_activity;
507 * Last latency observed from this peer.
509 struct GNUNET_TIME_Relative last_latency;
512 * At what frequency are we currently re-trying SET_KEY messages?
514 struct GNUNET_TIME_Relative set_key_retry_frequency;
517 * Tracking bandwidth for sending to this peer.
519 struct GNUNET_BANDWIDTH_Tracker available_send_window;
522 * Tracking bandwidth for receiving from this peer.
524 struct GNUNET_BANDWIDTH_Tracker available_recv_window;
527 * How valueable were the messages of this peer recently?
529 unsigned long long current_preference;
532 * Bit map indicating which of the 32 sequence numbers before the last
533 * were received (good for accepting out-of-order packets and
534 * estimating reliability of the connection)
536 unsigned int last_packets_bitmap;
539 * last sequence number received on this connection (highest)
541 uint32_t last_sequence_number_received;
544 * last sequence number transmitted
546 uint32_t last_sequence_number_sent;
549 * Available bandwidth in for this peer (current target).
551 struct GNUNET_BANDWIDTH_Value32NBO bw_in;
554 * Available bandwidth out for this peer (current target).
556 struct GNUNET_BANDWIDTH_Value32NBO bw_out;
559 * Internal bandwidth limit set for this peer (initially typically
560 * set to "-1"). Actual "bw_out" is MIN of
561 * "bpm_out_internal_limit" and "bw_out_external_limit".
563 struct GNUNET_BANDWIDTH_Value32NBO bw_out_internal_limit;
566 * External bandwidth limit set for this peer by the
567 * peer that we are communicating with. "bw_out" is MIN of
568 * "bw_out_internal_limit" and "bw_out_external_limit".
570 struct GNUNET_BANDWIDTH_Value32NBO bw_out_external_limit;
573 * What was our PING challenge number (for this peer)?
575 uint32_t ping_challenge;
578 * What was the last distance to this peer as reported by the transports?
580 uint32_t last_distance;
583 * What is our connection status?
585 enum PeerStateMachine status;
588 * Are we currently connected to this neighbour?
596 * Data structure for each client connected to the core service.
601 * Clients are kept in a linked list.
606 * Handle for the client with the server API.
608 struct GNUNET_SERVER_Client *client_handle;
611 * Array of the types of messages this peer cares
612 * about (with "tcnt" entries). Allocated as part
613 * of this client struct, do not free!
615 const uint16_t *types;
618 * Options for messages this client cares about,
619 * see GNUNET_CORE_OPTION_ values.
624 * Number of types of incoming messages this client
625 * specifically cares about. Size of the "types" array.
635 static struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded my_public_key;
640 static struct GNUNET_PeerIdentity my_identity;
645 static struct GNUNET_CRYPTO_RsaPrivateKey *my_private_key;
650 struct GNUNET_SCHEDULER_Handle *sched;
655 const struct GNUNET_CONFIGURATION_Handle *cfg;
660 static struct GNUNET_SERVER_Handle *server;
665 static struct GNUNET_TRANSPORT_Handle *transport;
668 * Linked list of our clients.
670 static struct Client *clients;
673 * Context for notifications we need to send to our clients.
675 static struct GNUNET_SERVER_NotificationContext *notifier;
678 * We keep neighbours in a linked list (for now).
680 static struct Neighbour *neighbours;
683 * Sum of all preferences among all neighbours.
685 static unsigned long long preference_sum;
688 * Total number of neighbours we have.
690 static unsigned int neighbour_count;
693 * How much inbound bandwidth are we supposed to be using per second?
694 * FIXME: this value is not used!
696 static unsigned long long bandwidth_target_in_bps;
699 * How much outbound bandwidth are we supposed to be using per second?
701 static unsigned long long bandwidth_target_out_bps;
706 * A preference value for a neighbour was update. Update
707 * the preference sum accordingly.
709 * @param inc how much was a preference value increased?
712 update_preference_sum (unsigned long long inc)
715 unsigned long long os;
718 preference_sum += inc;
719 if (preference_sum >= os)
721 /* overflow! compensate by cutting all values in half! */
726 n->current_preference /= 2;
727 preference_sum += n->current_preference;
734 * Find the entry for the given neighbour.
736 * @param peer identity of the neighbour
737 * @return NULL if we are not connected, otherwise the
740 static struct Neighbour *
741 find_neighbour (const struct GNUNET_PeerIdentity *peer)
743 struct Neighbour *ret;
746 while ((ret != NULL) &&
747 (0 != memcmp (&ret->peer,
748 peer, sizeof (struct GNUNET_PeerIdentity))))
755 * Send a message to one of our clients.
757 * @param client target for the message
758 * @param msg message to transmit
759 * @param can_drop could this message be dropped if the
760 * client's queue is getting too large?
763 send_to_client (struct Client *client,
764 const struct GNUNET_MessageHeader *msg,
767 #if DEBUG_CORE_CLIENT
768 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
769 "Preparing to send message of type %u to client.\n",
772 GNUNET_SERVER_notification_context_unicast (notifier,
773 client->client_handle,
780 * Send a message to all of our current clients that have
781 * the right options set.
783 * @param msg message to multicast
784 * @param can_drop can this message be discarded if the queue is too long
785 * @param options mask to use
788 send_to_all_clients (const struct GNUNET_MessageHeader *msg,
797 if (0 != (c->options & options))
798 send_to_client (c, msg, can_drop);
805 * Handle CORE_INIT request.
808 handle_client_init (void *cls,
809 struct GNUNET_SERVER_Client *client,
810 const struct GNUNET_MessageHeader *message)
812 const struct InitMessage *im;
813 struct InitReplyMessage irm;
816 const uint16_t *types;
819 struct ConnectNotifyMessage cnm;
822 #if DEBUG_CORE_CLIENT
823 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
824 "Client connecting to core service with `%s' message\n",
827 /* check that we don't have an entry already */
831 if (client == c->client_handle)
834 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
839 msize = ntohs (message->size);
840 if (msize < sizeof (struct InitMessage))
843 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
846 GNUNET_SERVER_notification_context_add (notifier, client);
847 im = (const struct InitMessage *) message;
848 types = (const uint16_t *) &im[1];
849 msize -= sizeof (struct InitMessage);
850 c = GNUNET_malloc (sizeof (struct Client) + msize);
851 c->client_handle = client;
854 c->tcnt = msize / sizeof (uint16_t);
855 c->types = (const uint16_t *) &c[1];
856 wtypes = (uint16_t *) &c[1];
857 for (i=0;i<c->tcnt;i++)
858 wtypes[i] = ntohs (types[i]);
859 c->options = ntohl (im->options);
860 #if DEBUG_CORE_CLIENT
861 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
862 "Client %p is interested in %u message types\n",
866 /* send init reply message */
867 irm.header.size = htons (sizeof (struct InitReplyMessage));
868 irm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_INIT_REPLY);
869 irm.reserved = htonl (0);
870 memcpy (&irm.publicKey,
872 sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
873 #if DEBUG_CORE_CLIENT
874 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
875 "Sending `%s' message to client.\n", "INIT_REPLY");
877 send_to_client (c, &irm.header, GNUNET_NO);
878 /* notify new client about existing neighbours */
879 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
880 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
884 if (n->status == PEER_STATE_KEY_CONFIRMED)
886 #if DEBUG_CORE_CLIENT
887 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
888 "Sending `%s' message to client.\n", "NOTIFY_CONNECT");
890 cnm.distance = htonl (n->last_distance);
891 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
893 send_to_client (c, &cnm.header, GNUNET_NO);
897 GNUNET_SERVER_receive_done (client, GNUNET_OK);
902 * A client disconnected, clean up.
905 * @param client identification of the client
908 handle_client_disconnect (void *cls, struct GNUNET_SERVER_Client *client)
915 #if DEBUG_CORE_CLIENT
916 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
917 "Client %p has disconnected from core service.\n",
924 if (client == pos->client_handle)
929 prev->next = pos->next;
936 /* client never sent INIT */
941 * Handle REQUEST_INFO request.
944 handle_client_request_info (void *cls,
945 struct GNUNET_SERVER_Client *client,
946 const struct GNUNET_MessageHeader *message)
948 const struct RequestInfoMessage *rcm;
950 struct ConfigurationInfoMessage cim;
953 unsigned long long old_preference;
954 struct GNUNET_SERVER_TransmitContext *tc;
956 #if DEBUG_CORE_CLIENT
957 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
958 "Core service receives `%s' request.\n", "REQUEST_INFO");
960 rcm = (const struct RequestInfoMessage *) message;
961 n = find_neighbour (&rcm->peer);
962 memset (&cim, 0, sizeof (cim));
965 want_reserv = ntohl (rcm->reserve_inbound);
966 n->bw_out_internal_limit = rcm->limit_outbound;
967 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_internal_limit,
968 n->bw_out_external_limit);
969 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_recv_window,
973 got_reserv = want_reserv;
975 else if (want_reserv > 0)
977 if (GNUNET_BANDWIDTH_tracker_get_delay (&n->available_recv_window,
978 want_reserv).value == 0)
979 got_reserv = want_reserv;
981 got_reserv = 0; /* all or nothing */
985 GNUNET_BANDWIDTH_tracker_consume (&n->available_recv_window,
987 old_preference = n->current_preference;
988 n->current_preference += GNUNET_ntohll(rcm->preference_change);
989 if (old_preference > n->current_preference)
991 /* overflow; cap at maximum value */
992 n->current_preference = (unsigned long long) -1;
994 update_preference_sum (n->current_preference - old_preference);
996 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
997 "Received reservation request for %d bytes for peer `%4s', reserved %d bytes\n",
999 GNUNET_i2s (&rcm->peer),
1002 cim.reserved_amount = htonl (got_reserv);
1003 cim.bw_in = n->bw_in;
1004 cim.bw_out = n->bw_out;
1005 cim.preference = n->current_preference;
1007 cim.header.size = htons (sizeof (struct ConfigurationInfoMessage));
1008 cim.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_CONFIGURATION_INFO);
1009 cim.peer = rcm->peer;
1011 #if DEBUG_CORE_CLIENT
1012 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1013 "Sending `%s' message to client.\n", "CONFIGURATION_INFO");
1015 tc = GNUNET_SERVER_transmit_context_create (client);
1016 GNUNET_SERVER_transmit_context_append_message (tc, &cim.header);
1017 GNUNET_SERVER_transmit_context_run (tc,
1018 GNUNET_TIME_UNIT_FOREVER_REL);
1023 * Free the given entry for the neighbour (it has
1024 * already been removed from the list at this point).
1026 * @param n neighbour to free
1029 free_neighbour (struct Neighbour *n)
1031 struct MessageEntry *m;
1033 if (n->pitr != NULL)
1035 GNUNET_PEERINFO_iterate_cancel (n->pitr);
1040 GNUNET_free (n->skm);
1043 while (NULL != (m = n->messages))
1045 n->messages = m->next;
1048 while (NULL != (m = n->encrypted_head))
1050 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1057 GNUNET_TRANSPORT_notify_transmit_ready_cancel (n->th);
1060 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1061 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1062 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
1063 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
1064 if (n->quota_update_task != GNUNET_SCHEDULER_NO_TASK)
1065 GNUNET_SCHEDULER_cancel (sched, n->quota_update_task);
1066 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1067 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1068 GNUNET_free_non_null (n->public_key);
1069 GNUNET_free_non_null (n->pending_ping);
1070 GNUNET_free_non_null (n->pending_pong);
1076 * Consider freeing the given neighbour since we may not need
1077 * to keep it around anymore.
1079 * @param n neighbour to consider discarding
1082 consider_free_neighbour (struct Neighbour *n);
1086 * Task triggered when a neighbour entry might have gotten stale.
1088 * @param cls the 'struct Neighbour'
1089 * @param tc scheduler context (not used)
1092 consider_free_task (void *cls,
1093 const struct GNUNET_SCHEDULER_TaskContext *tc)
1095 struct Neighbour *n = cls;
1096 n->dead_clean_task = GNUNET_SCHEDULER_NO_TASK;
1097 consider_free_neighbour (n);
1102 * Consider freeing the given neighbour since we may not need
1103 * to keep it around anymore.
1105 * @param n neighbour to consider discarding
1108 consider_free_neighbour (struct Neighbour *n)
1110 struct Neighbour *pos;
1111 struct Neighbour *prev;
1112 struct GNUNET_TIME_Relative left;
1114 if ( (n->th != NULL) ||
1115 (n->pitr != NULL) ||
1116 (n->status == PEER_STATE_KEY_CONFIRMED) ||
1117 (GNUNET_YES == n->is_connected) )
1118 return; /* no chance */
1120 left = GNUNET_TIME_absolute_get_remaining (GNUNET_TIME_absolute_add (n->last_activity,
1124 if (n->dead_clean_task != GNUNET_SCHEDULER_NO_TASK)
1125 GNUNET_SCHEDULER_cancel (sched, n->dead_clean_task);
1126 n->dead_clean_task = GNUNET_SCHEDULER_add_delayed (sched,
1128 &consider_free_task,
1132 /* actually free the neighbour... */
1141 neighbours = n->next;
1143 prev->next = n->next;
1144 GNUNET_assert (neighbour_count > 0);
1151 * Check if we have encrypted messages for the specified neighbour
1152 * pending, and if so, check with the transport about sending them
1155 * @param n neighbour to check.
1157 static void process_encrypted_neighbour_queue (struct Neighbour *n);
1161 * Function called when the transport service is ready to
1162 * receive an encrypted message for the respective peer
1164 * @param cls neighbour to use message from
1165 * @param size number of bytes we can transmit
1166 * @param buf where to copy the message
1167 * @return number of bytes transmitted
1170 notify_encrypted_transmit_ready (void *cls, size_t size, void *buf)
1172 struct Neighbour *n = cls;
1173 struct MessageEntry *m;
1178 GNUNET_assert (NULL != (m = n->encrypted_head));
1179 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1186 GNUNET_assert (size >= m->size);
1187 memcpy (cbuf, &m[1], m->size);
1189 GNUNET_BANDWIDTH_tracker_consume (&n->available_send_window,
1192 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1193 "Copied message of type %u and size %u into transport buffer for `%4s'\n",
1194 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1195 ret, GNUNET_i2s (&n->peer));
1197 process_encrypted_neighbour_queue (n);
1202 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1203 "Transmission of message of type %u and size %u failed\n",
1204 ntohs (((struct GNUNET_MessageHeader *) &m[1])->type),
1209 consider_free_neighbour (n);
1215 * Check if we have plaintext messages for the specified neighbour
1216 * pending, and if so, consider batching and encrypting them (and
1217 * then trigger processing of the encrypted queue if needed).
1219 * @param n neighbour to check.
1221 static void process_plaintext_neighbour_queue (struct Neighbour *n);
1225 * Check if we have encrypted messages for the specified neighbour
1226 * pending, and if so, check with the transport about sending them
1229 * @param n neighbour to check.
1232 process_encrypted_neighbour_queue (struct Neighbour *n)
1234 struct MessageEntry *m;
1237 return; /* request already pending */
1238 m = n->encrypted_head;
1241 /* encrypted queue empty, try plaintext instead */
1242 process_plaintext_neighbour_queue (n);
1246 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1247 "Asking transport for transmission of %u bytes to `%4s' in next %llu ms\n",
1249 GNUNET_i2s (&n->peer),
1250 GNUNET_TIME_absolute_get_remaining (m->deadline).
1254 GNUNET_TRANSPORT_notify_transmit_ready (transport, &n->peer,
1257 GNUNET_TIME_absolute_get_remaining
1259 ¬ify_encrypted_transmit_ready,
1263 /* message request too large or duplicate request */
1265 /* discard encrypted message */
1266 GNUNET_CONTAINER_DLL_remove (n->encrypted_head,
1270 process_encrypted_neighbour_queue (n);
1276 * Decrypt size bytes from in and write the result to out. Use the
1277 * key for inbound traffic of the given neighbour. This function does
1278 * NOT do any integrity-checks on the result.
1280 * @param n neighbour we are receiving from
1281 * @param iv initialization vector to use
1282 * @param in ciphertext
1283 * @param out plaintext
1284 * @param size size of in/out
1285 * @return GNUNET_OK on success
1288 do_decrypt (struct Neighbour *n,
1289 const GNUNET_HashCode * iv,
1290 const void *in, void *out, size_t size)
1292 if (size != (uint16_t) size)
1297 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
1298 (n->status != PEER_STATE_KEY_CONFIRMED))
1300 GNUNET_break_op (0);
1301 return GNUNET_SYSERR;
1304 GNUNET_CRYPTO_aes_decrypt (in,
1308 GNUNET_CRYPTO_AesInitializationVector *) iv,
1312 return GNUNET_SYSERR;
1315 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1316 "Decrypted %u bytes from `%4s' using key %u\n",
1317 size, GNUNET_i2s (&n->peer), n->decrypt_key.crc32);
1324 * Encrypt size bytes from in and write the result to out. Use the
1325 * key for outbound traffic of the given neighbour.
1327 * @param n neighbour we are sending to
1328 * @param iv initialization vector to use
1329 * @param in ciphertext
1330 * @param out plaintext
1331 * @param size size of in/out
1332 * @return GNUNET_OK on success
1335 do_encrypt (struct Neighbour *n,
1336 const GNUNET_HashCode * iv,
1337 const void *in, void *out, size_t size)
1339 if (size != (uint16_t) size)
1344 GNUNET_assert (size ==
1345 GNUNET_CRYPTO_aes_encrypt (in,
1349 GNUNET_CRYPTO_AesInitializationVector
1352 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1353 "Encrypted %u bytes for `%4s' using key %u\n", size,
1354 GNUNET_i2s (&n->peer), n->encrypt_key.crc32);
1361 * Select messages for transmission. This heuristic uses a combination
1362 * of earliest deadline first (EDF) scheduling (with bounded horizon)
1363 * and priority-based discard (in case no feasible schedule exist) and
1364 * speculative optimization (defer any kind of transmission until
1365 * we either create a batch of significant size, 25% of max, or until
1366 * we are close to a deadline). Furthermore, when scheduling the
1367 * heuristic also packs as many messages into the batch as possible,
1368 * starting with those with the earliest deadline. Yes, this is fun.
1370 * @param n neighbour to select messages from
1371 * @param size number of bytes to select for transmission
1372 * @param retry_time set to the time when we should try again
1373 * (only valid if this function returns zero)
1374 * @return number of bytes selected, or 0 if we decided to
1375 * defer scheduling overall; in that case, retry_time is set.
1378 select_messages (struct Neighbour *n,
1379 size_t size, struct GNUNET_TIME_Relative *retry_time)
1381 struct MessageEntry *pos;
1382 struct MessageEntry *min;
1383 struct MessageEntry *last;
1384 unsigned int min_prio;
1385 struct GNUNET_TIME_Absolute t;
1386 struct GNUNET_TIME_Absolute now;
1387 struct GNUNET_TIME_Relative delta;
1389 struct GNUNET_TIME_Relative slack; /* how long could we wait before missing deadlines? */
1392 unsigned int queue_size;
1393 int discard_low_prio;
1395 GNUNET_assert (NULL != n->messages);
1396 now = GNUNET_TIME_absolute_get ();
1397 /* last entry in linked list of messages processed */
1399 /* should we remove the entry with the lowest
1400 priority from consideration for scheduling at the
1411 discard_low_prio = GNUNET_YES;
1412 while (GNUNET_YES == discard_low_prio)
1416 discard_low_prio = GNUNET_NO;
1417 /* calculate number of bytes available for transmission at time "t" */
1418 avail = GNUNET_BANDWIDTH_tracker_get_available (&n->available_send_window);
1420 /* how many bytes have we (hypothetically) scheduled so far */
1422 /* maximum time we can wait before transmitting anything
1423 and still make all of our deadlines */
1424 slack = MAX_CORK_DELAY;
1426 /* note that we use "*2" here because we want to look
1427 a bit further into the future; much more makes no
1428 sense since new message might be scheduled in the
1430 while ((pos != NULL) && (off < size * 2))
1432 if (pos->do_transmit == GNUNET_YES)
1434 /* already removed from consideration */
1438 if (discard_low_prio == GNUNET_NO)
1440 delta = GNUNET_TIME_absolute_get_difference (t, pos->deadline);
1441 if (delta.value > 0)
1443 // FIXME: HUH? Check!
1445 avail += GNUNET_BANDWIDTH_value_get_available_until (n->bw_out,
1448 if (avail < pos->size)
1450 // FIXME: HUH? Check!
1451 discard_low_prio = GNUNET_YES; /* we could not schedule this one! */
1456 /* update slack, considering both its absolute deadline
1457 and relative deadlines caused by other messages
1458 with their respective load */
1459 slack = GNUNET_TIME_relative_min (slack,
1460 GNUNET_BANDWIDTH_value_get_delay_for (n->bw_out,
1462 if (pos->deadline.value <= now.value)
1465 slack = GNUNET_TIME_UNIT_ZERO;
1467 else if (GNUNET_YES == pos->got_slack)
1469 /* should be soon now! */
1470 slack = GNUNET_TIME_relative_min (slack,
1471 GNUNET_TIME_absolute_get_remaining (pos->slack_deadline));
1476 GNUNET_TIME_relative_min (slack,
1477 GNUNET_TIME_absolute_get_difference (now, pos->deadline));
1478 pos->got_slack = GNUNET_YES;
1479 pos->slack_deadline = GNUNET_TIME_absolute_min (pos->deadline,
1480 GNUNET_TIME_relative_to_absolute (MAX_CORK_DELAY));
1485 t = GNUNET_TIME_absolute_max (pos->deadline, t); // HUH? Check!
1486 if (pos->priority <= min_prio)
1488 /* update min for discard */
1489 min_prio = pos->priority;
1494 if (discard_low_prio)
1496 GNUNET_assert (min != NULL);
1497 /* remove lowest-priority entry from consideration */
1498 min->do_transmit = GNUNET_YES; /* means: discard (for now) */
1502 /* guard against sending "tiny" messages with large headers without
1504 if ( (slack.value > 0) &&
1506 (queue_size <= MAX_PEER_QUEUE_SIZE - 2) )
1508 /* less than 25% of message would be filled with deadlines still
1509 being met if we delay by one second or more; so just wait for
1510 more data; but do not wait longer than 1s (since we don't want
1511 to delay messages for a really long time either). */
1512 *retry_time = MAX_CORK_DELAY;
1513 /* reset do_transmit values for next time */
1516 pos->do_transmit = GNUNET_NO;
1520 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1521 "Deferring transmission for %llums due to underfull message buffer size (%u/%u)\n",
1522 (unsigned long long) slack.value,
1524 (unsigned int) size);
1528 /* select marked messages (up to size) for transmission */
1533 if ((pos->size <= size) && (pos->do_transmit == GNUNET_NO))
1535 pos->do_transmit = GNUNET_YES; /* mark for transmission */
1540 pos->do_transmit = GNUNET_NO; /* mark for not transmitting! */
1544 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1545 "Selected %u/%u bytes of %u/%u plaintext messages for transmission to `%4s'.\n",
1547 queue_size, MAX_PEER_QUEUE_SIZE,
1548 GNUNET_i2s (&n->peer));
1555 * Batch multiple messages into a larger buffer.
1557 * @param n neighbour to take messages from
1558 * @param buf target buffer
1559 * @param size size of buf
1560 * @param deadline set to transmission deadline for the result
1561 * @param retry_time set to the time when we should try again
1562 * (only valid if this function returns zero)
1563 * @param priority set to the priority of the batch
1564 * @return number of bytes written to buf (can be zero)
1567 batch_message (struct Neighbour *n,
1570 struct GNUNET_TIME_Absolute *deadline,
1571 struct GNUNET_TIME_Relative *retry_time,
1572 unsigned int *priority)
1574 char ntmb[GNUNET_SERVER_MAX_MESSAGE_SIZE];
1575 struct NotifyTrafficMessage *ntm = (struct NotifyTrafficMessage*) ntmb;
1576 struct MessageEntry *pos;
1577 struct MessageEntry *prev;
1578 struct MessageEntry *next;
1583 *deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1584 *retry_time = GNUNET_TIME_UNIT_FOREVER_REL;
1585 if (0 == select_messages (n, size, retry_time))
1587 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1588 "No messages selected, will try again in %llu ms\n",
1592 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_OUTBOUND);
1593 ntm->distance = htonl (n->last_distance);
1594 ntm->latency = GNUNET_TIME_relative_hton (n->last_latency);
1595 ntm->peer = n->peer;
1599 while ((pos != NULL) && (size >= sizeof (struct GNUNET_MessageHeader)))
1602 if (GNUNET_YES == pos->do_transmit)
1604 GNUNET_assert (pos->size <= size);
1605 /* do notifications */
1606 /* FIXME: track if we have *any* client that wants
1607 full notifications and only do this if that is
1609 if (pos->size < GNUNET_SERVER_MAX_MESSAGE_SIZE - sizeof (struct NotifyTrafficMessage))
1611 memcpy (&ntm[1], &pos[1], pos->size);
1612 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1613 sizeof (struct GNUNET_MessageHeader));
1614 send_to_all_clients (&ntm->header,
1616 GNUNET_CORE_OPTION_SEND_HDR_OUTBOUND);
1620 /* message too large for 'full' notifications, we do at
1621 least the 'hdr' type */
1624 sizeof (struct GNUNET_MessageHeader));
1626 ntm->header.size = htons (sizeof (struct NotifyTrafficMessage) +
1628 send_to_all_clients (&ntm->header,
1630 GNUNET_CORE_OPTION_SEND_FULL_OUTBOUND);
1633 "Encrypting message of type %u\n",
1634 ntohs(((struct GNUNET_MessageHeader*)&pos[1])->type));
1636 /* copy for encrypted transmission */
1637 memcpy (&buf[ret], &pos[1], pos->size);
1640 *priority += pos->priority;
1642 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1643 "Adding plaintext message with deadline %llu ms to batch\n",
1644 GNUNET_TIME_absolute_get_remaining (pos->deadline).value);
1646 deadline->value = GNUNET_MIN (deadline->value, pos->deadline.value);
1660 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1661 "Deadline for message batch is %llu ms\n",
1662 GNUNET_TIME_absolute_get_remaining (*deadline).value);
1669 * Remove messages with deadlines that have long expired from
1672 * @param n neighbour to inspect
1675 discard_expired_messages (struct Neighbour *n)
1677 struct MessageEntry *prev;
1678 struct MessageEntry *next;
1679 struct MessageEntry *pos;
1680 struct GNUNET_TIME_Absolute now;
1681 struct GNUNET_TIME_Relative delta;
1683 now = GNUNET_TIME_absolute_get ();
1689 delta = GNUNET_TIME_absolute_get_difference (pos->deadline, now);
1690 if (delta.value > PAST_EXPIRATION_DISCARD_TIME.value)
1693 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
1694 "Message is %llu ms past due, discarding.\n",
1711 * Signature of the main function of a task.
1713 * @param cls closure
1714 * @param tc context information (why was this task triggered now)
1717 retry_plaintext_processing (void *cls,
1718 const struct GNUNET_SCHEDULER_TaskContext *tc)
1720 struct Neighbour *n = cls;
1722 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1723 process_plaintext_neighbour_queue (n);
1728 * Send our key (and encrypted PING) to the other peer.
1730 * @param n the other peer
1732 static void send_key (struct Neighbour *n);
1735 * Task that will retry "send_key" if our previous attempt failed
1739 set_key_retry_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1741 struct Neighbour *n = cls;
1743 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1744 "Retrying key transmission to `%4s'\n",
1745 GNUNET_i2s (&n->peer));
1746 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
1747 n->set_key_retry_frequency =
1748 GNUNET_TIME_relative_multiply (n->set_key_retry_frequency, 2);
1754 * Check if we have plaintext messages for the specified neighbour
1755 * pending, and if so, consider batching and encrypting them (and
1756 * then trigger processing of the encrypted queue if needed).
1758 * @param n neighbour to check.
1761 process_plaintext_neighbour_queue (struct Neighbour *n)
1763 char pbuf[MAX_ENCRYPTED_MESSAGE_SIZE]; /* plaintext */
1766 struct EncryptedMessage *em; /* encrypted message */
1767 struct EncryptedMessage *ph; /* plaintext header */
1768 struct MessageEntry *me;
1769 unsigned int priority;
1770 struct GNUNET_TIME_Absolute deadline;
1771 struct GNUNET_TIME_Relative retry_time;
1774 if (n->retry_plaintext_task != GNUNET_SCHEDULER_NO_TASK)
1776 GNUNET_SCHEDULER_cancel (sched, n->retry_plaintext_task);
1777 n->retry_plaintext_task = GNUNET_SCHEDULER_NO_TASK;
1781 case PEER_STATE_DOWN:
1784 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1785 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1786 GNUNET_i2s(&n->peer));
1789 case PEER_STATE_KEY_SENT:
1790 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1791 n->retry_set_key_task
1792 = GNUNET_SCHEDULER_add_delayed (sched,
1793 n->set_key_retry_frequency,
1794 &set_key_retry_task, n);
1796 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1797 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1798 GNUNET_i2s(&n->peer));
1801 case PEER_STATE_KEY_RECEIVED:
1802 if (n->retry_set_key_task == GNUNET_SCHEDULER_NO_TASK)
1803 n->retry_set_key_task
1804 = GNUNET_SCHEDULER_add_delayed (sched,
1805 n->set_key_retry_frequency,
1806 &set_key_retry_task, n);
1808 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1809 "Not yet connected to `%4s', deferring processing of plaintext messages.\n",
1810 GNUNET_i2s(&n->peer));
1813 case PEER_STATE_KEY_CONFIRMED:
1814 /* ready to continue */
1817 discard_expired_messages (n);
1818 if (n->messages == NULL)
1821 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1822 "Plaintext message queue for `%4s' is empty.\n",
1823 GNUNET_i2s(&n->peer));
1825 return; /* no pending messages */
1827 if (n->encrypted_head != NULL)
1830 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1831 "Encrypted message queue for `%4s' is still full, delaying plaintext processing.\n",
1832 GNUNET_i2s(&n->peer));
1834 return; /* wait for messages already encrypted to be
1837 ph = (struct EncryptedMessage *) pbuf;
1838 deadline = GNUNET_TIME_UNIT_FOREVER_ABS;
1840 used = sizeof (struct EncryptedMessage);
1841 used += batch_message (n,
1843 MAX_ENCRYPTED_MESSAGE_SIZE - used,
1844 &deadline, &retry_time, &priority);
1845 if (used == sizeof (struct EncryptedMessage))
1848 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1849 "No messages selected for transmission to `%4s' at this time, will try again later.\n",
1850 GNUNET_i2s(&n->peer));
1852 /* no messages selected for sending, try again later... */
1853 n->retry_plaintext_task =
1854 GNUNET_SCHEDULER_add_delayed (sched,
1856 &retry_plaintext_processing, n);
1859 #if DEBUG_CORE_QUOTA
1860 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1861 "Sending %u b/s as new limit to peer `%4s'\n",
1862 (unsigned int) ntohl (n->bw_in.value__),
1863 GNUNET_i2s (&n->peer));
1865 ph->iv_seed = htonl (GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, -1));
1866 ph->sequence_number = htonl (++n->last_sequence_number_sent);
1867 ph->inbound_bw_limit = n->bw_in;
1868 ph->timestamp = GNUNET_TIME_absolute_hton (GNUNET_TIME_absolute_get ());
1870 /* setup encryption message header */
1871 me = GNUNET_malloc (sizeof (struct MessageEntry) + used);
1872 me->deadline = deadline;
1873 me->priority = priority;
1875 em = (struct EncryptedMessage *) &me[1];
1876 em->header.size = htons (used);
1877 em->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE);
1878 em->iv_seed = ph->iv_seed;
1879 esize = used - ENCRYPTED_HEADER_SIZE;
1880 GNUNET_CRYPTO_hash (&ph->sequence_number,
1881 esize - sizeof (GNUNET_HashCode),
1882 &ph->plaintext_hash);
1883 GNUNET_CRYPTO_hash (&ph->iv_seed, sizeof (uint32_t), &iv);
1886 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
1887 "Encrypting %u bytes of plaintext messages for `%4s' for transmission in %llums.\n",
1889 GNUNET_i2s(&n->peer),
1890 (unsigned long long) GNUNET_TIME_absolute_get_remaining (deadline).value);
1892 GNUNET_assert (GNUNET_OK ==
1895 &ph->plaintext_hash,
1896 &em->plaintext_hash, esize));
1897 /* append to transmission list */
1898 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
1902 process_encrypted_neighbour_queue (n);
1907 * Function that recalculates the bandwidth quota for the
1908 * given neighbour and transmits it to the transport service.
1910 * @param cls neighbour for the quota update
1914 neighbour_quota_update (void *cls,
1915 const struct GNUNET_SCHEDULER_TaskContext *tc);
1919 * Schedule the task that will recalculate the bandwidth
1920 * quota for this peer (and possibly force a disconnect of
1921 * idle peers by calculating a bandwidth of zero).
1924 schedule_quota_update (struct Neighbour *n)
1926 GNUNET_assert (n->quota_update_task ==
1927 GNUNET_SCHEDULER_NO_TASK);
1928 n->quota_update_task
1929 = GNUNET_SCHEDULER_add_delayed (sched,
1930 QUOTA_UPDATE_FREQUENCY,
1931 &neighbour_quota_update,
1937 * Initialize a new 'struct Neighbour'.
1939 * @param pid ID of the new neighbour
1940 * @return handle for the new neighbour
1942 static struct Neighbour *
1943 create_neighbour (const struct GNUNET_PeerIdentity *pid)
1945 struct Neighbour *n;
1946 struct GNUNET_TIME_Absolute now;
1948 n = GNUNET_malloc (sizeof (struct Neighbour));
1949 n->next = neighbours;
1953 GNUNET_CRYPTO_aes_create_session_key (&n->encrypt_key);
1954 now = GNUNET_TIME_absolute_get ();
1955 n->encrypt_key_created = now;
1956 n->last_activity = now;
1957 n->set_key_retry_frequency = INITIAL_SET_KEY_RETRY_FREQUENCY;
1958 n->bw_in = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
1959 n->bw_out = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
1960 n->bw_out_internal_limit = GNUNET_BANDWIDTH_value_init ((uint32_t) - 1);
1961 n->bw_out_external_limit = GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT;
1962 n->ping_challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
1964 neighbour_quota_update (n, NULL);
1970 * Handle CORE_SEND request.
1973 * @param client the client issuing the request
1974 * @param message the "struct SendMessage"
1977 handle_client_send (void *cls,
1978 struct GNUNET_SERVER_Client *client,
1979 const struct GNUNET_MessageHeader *message)
1981 const struct SendMessage *sm;
1982 struct Neighbour *n;
1983 struct MessageEntry *prev;
1984 struct MessageEntry *pos;
1985 struct MessageEntry *e;
1986 struct MessageEntry *min_prio_entry;
1987 struct MessageEntry *min_prio_prev;
1988 unsigned int min_prio;
1989 unsigned int queue_size;
1992 msize = ntohs (message->size);
1994 sizeof (struct SendMessage) + sizeof (struct GNUNET_MessageHeader))
1998 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2001 sm = (const struct SendMessage *) message;
2002 msize -= sizeof (struct SendMessage);
2003 n = find_neighbour (&sm->peer);
2005 n = create_neighbour (&sm->peer);
2007 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2008 "Core received `%s' request, queueing %u bytes of plaintext data for transmission to `%4s'.\n",
2011 GNUNET_i2s (&sm->peer));
2013 /* bound queue size */
2014 discard_expired_messages (n);
2015 min_prio = (unsigned int) -1;
2016 min_prio_entry = NULL;
2017 min_prio_prev = NULL;
2023 if (pos->priority < min_prio)
2025 min_prio_entry = pos;
2026 min_prio_prev = prev;
2027 min_prio = pos->priority;
2033 if (queue_size >= MAX_PEER_QUEUE_SIZE)
2036 if (ntohl(sm->priority) <= min_prio)
2038 /* discard new entry */
2040 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2041 "Queue full (%u/%u), discarding new request (%u bytes of type %u)\n",
2043 MAX_PEER_QUEUE_SIZE,
2045 ntohs (message->type));
2048 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2051 /* discard "min_prio_entry" */
2053 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2054 "Queue full, discarding existing older request\n");
2056 if (min_prio_prev == NULL)
2057 n->messages = min_prio_entry->next;
2059 min_prio_prev->next = min_prio_entry->next;
2060 GNUNET_free (min_prio_entry);
2064 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2065 "Adding transmission request for `%4s' of size %u to queue\n",
2066 GNUNET_i2s (&sm->peer),
2069 e = GNUNET_malloc (sizeof (struct MessageEntry) + msize);
2070 e->deadline = GNUNET_TIME_absolute_ntoh (sm->deadline);
2071 e->priority = ntohl (sm->priority);
2073 memcpy (&e[1], &sm[1], msize);
2075 /* insert, keep list sorted by deadline */
2078 while ((pos != NULL) && (pos->deadline.value < e->deadline.value))
2089 /* consider scheduling now */
2090 process_plaintext_neighbour_queue (n);
2092 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2097 * Function called when the transport service is ready to
2098 * receive a message. Only resets 'n->th' to NULL.
2100 * @param cls neighbour to use message from
2101 * @param size number of bytes we can transmit
2102 * @param buf where to copy the message
2103 * @return number of bytes transmitted
2106 notify_transport_connect_done (void *cls, size_t size, void *buf)
2108 struct Neighbour *n = cls;
2113 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
2114 _("Failed to connect to `%4s': transport failed to connect\n"),
2115 GNUNET_i2s (&n->peer));
2124 * Handle CORE_REQUEST_CONNECT request.
2127 * @param client the client issuing the request
2128 * @param message the "struct ConnectMessage"
2131 handle_client_request_connect (void *cls,
2132 struct GNUNET_SERVER_Client *client,
2133 const struct GNUNET_MessageHeader *message)
2135 const struct ConnectMessage *cm = (const struct ConnectMessage*) message;
2136 struct Neighbour *n;
2137 struct GNUNET_TIME_Relative timeout;
2139 if (0 == memcmp (&cm->peer, &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2142 GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
2145 GNUNET_SERVER_receive_done (client, GNUNET_OK);
2146 n = find_neighbour (&cm->peer);
2148 n = create_neighbour (&cm->peer);
2149 if ( (n->is_connected) ||
2151 return; /* already connected, or at least trying */
2153 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2154 "Core received `%s' request for `%4s', will try to establish connection\n",
2156 GNUNET_i2s (&cm->peer));
2158 timeout = GNUNET_TIME_relative_ntoh (cm->timeout);
2159 /* ask transport to connect to the peer */
2160 n->th = GNUNET_TRANSPORT_notify_transmit_ready (transport,
2162 sizeof (struct GNUNET_MessageHeader), 0,
2164 ¬ify_transport_connect_done,
2166 GNUNET_break (NULL != n->th);
2171 * List of handlers for the messages understood by this
2174 static struct GNUNET_SERVER_MessageHandler handlers[] = {
2175 {&handle_client_init, NULL,
2176 GNUNET_MESSAGE_TYPE_CORE_INIT, 0},
2177 {&handle_client_request_info, NULL,
2178 GNUNET_MESSAGE_TYPE_CORE_REQUEST_INFO,
2179 sizeof (struct RequestInfoMessage)},
2180 {&handle_client_send, NULL,
2181 GNUNET_MESSAGE_TYPE_CORE_SEND, 0},
2182 {&handle_client_request_connect, NULL,
2183 GNUNET_MESSAGE_TYPE_CORE_REQUEST_CONNECT,
2184 sizeof (struct ConnectMessage)},
2190 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2191 * the neighbour's struct and retry send_key. Or, if we did not get a
2192 * HELLO, just do nothing.
2194 * @param cls the 'struct Neighbour' to retry sending the key for
2195 * @param peer the peer for which this is the HELLO
2196 * @param hello HELLO message of that peer
2197 * @param trust amount of trust we currently have in that peer
2200 process_hello_retry_send_key (void *cls,
2201 const struct GNUNET_PeerIdentity *peer,
2202 const struct GNUNET_HELLO_Message *hello,
2205 struct Neighbour *n = cls;
2210 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2211 "Entered `process_hello_retry_send_key' and `peer' is NULL!\n");
2214 if (n->public_key != NULL)
2220 if (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task)
2221 n->retry_set_key_task
2222 = GNUNET_SCHEDULER_add_delayed (sched,
2223 n->set_key_retry_frequency,
2224 &set_key_retry_task, n);
2230 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2231 "Entered `process_hello_retry_send_key' for peer `%4s'\n",
2234 if (n->public_key != NULL)
2237 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2238 "already have public key for peer %s!! (so why are we here?)\n",
2245 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2246 "Received new `%s' message for `%4s', initiating key exchange.\n",
2251 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2252 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2254 GNUNET_free (n->public_key);
2255 n->public_key = NULL;
2257 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2258 "GNUNET_HELLO_get_key returned awfully\n");
2266 * Send our key (and encrypted PING) to the other peer.
2268 * @param n the other peer
2271 send_key (struct Neighbour *n)
2273 struct SetKeyMessage *sm;
2274 struct MessageEntry *me;
2275 struct PingMessage pp;
2276 struct PingMessage *pm;
2278 if ( (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK) ||
2282 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2283 "Key exchange in progress with `%4s'.\n",
2284 GNUNET_i2s (&n->peer));
2286 return; /* already in progress */
2290 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2291 "Asked to perform key exchange with `%4s'.\n",
2292 GNUNET_i2s (&n->peer));
2294 if (n->public_key == NULL)
2296 /* lookup n's public key, then try again */
2298 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2299 "Lacking public key for `%4s', trying to obtain one (send_key).\n",
2300 GNUNET_i2s (&n->peer));
2302 GNUNET_assert (n->pitr == NULL);
2303 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2307 GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 20),
2308 &process_hello_retry_send_key, n);
2311 /* first, set key message */
2312 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2313 sizeof (struct SetKeyMessage));
2314 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_SET_KEY_DELAY);
2315 me->priority = SET_KEY_PRIORITY;
2316 me->size = sizeof (struct SetKeyMessage);
2317 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2321 sm = (struct SetKeyMessage *) &me[1];
2322 sm->header.size = htons (sizeof (struct SetKeyMessage));
2323 sm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_SET_KEY);
2324 sm->sender_status = htonl ((int32_t) ((n->status == PEER_STATE_DOWN) ?
2325 PEER_STATE_KEY_SENT : n->status));
2327 htonl (sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2328 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2329 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2330 sizeof (struct GNUNET_PeerIdentity));
2331 sm->purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_SET_KEY);
2332 sm->creation_time = GNUNET_TIME_absolute_hton (n->encrypt_key_created);
2333 sm->target = n->peer;
2334 GNUNET_assert (GNUNET_OK ==
2335 GNUNET_CRYPTO_rsa_encrypt (&n->encrypt_key,
2337 GNUNET_CRYPTO_AesSessionKey),
2339 &sm->encrypted_key));
2340 GNUNET_assert (GNUNET_OK ==
2341 GNUNET_CRYPTO_rsa_sign (my_private_key, &sm->purpose,
2344 /* second, encrypted PING message */
2345 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2346 sizeof (struct PingMessage));
2347 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PING_DELAY);
2348 me->priority = PING_PRIORITY;
2349 me->size = sizeof (struct PingMessage);
2350 n->encrypted_tail->next = me;
2351 n->encrypted_tail = me;
2352 pm = (struct PingMessage *) &me[1];
2353 pm->header.size = htons (sizeof (struct PingMessage));
2354 pm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PING);
2355 pp.challenge = htonl (n->ping_challenge);
2356 pp.target = n->peer;
2358 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2359 "Encrypting `%s' and `%s' messages for `%4s'.\n",
2360 "SET_KEY", "PING", GNUNET_i2s (&n->peer));
2361 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2362 "Sending `%s' to `%4s' with challenge %u encrypted using key %u\n",
2364 GNUNET_i2s (&n->peer), n->ping_challenge, n->encrypt_key.crc32);
2367 &n->peer.hashPubKey,
2370 sizeof (struct PingMessage) -
2371 sizeof (struct GNUNET_MessageHeader));
2375 case PEER_STATE_DOWN:
2376 n->status = PEER_STATE_KEY_SENT;
2378 case PEER_STATE_KEY_SENT:
2380 case PEER_STATE_KEY_RECEIVED:
2382 case PEER_STATE_KEY_CONFIRMED:
2389 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2390 "Have %llu ms left for `%s' transmission.\n",
2391 (unsigned long long) GNUNET_TIME_absolute_get_remaining (me->deadline).value,
2394 /* trigger queue processing */
2395 process_encrypted_neighbour_queue (n);
2396 if ( (n->status != PEER_STATE_KEY_CONFIRMED) &&
2397 (GNUNET_SCHEDULER_NO_TASK == n->retry_set_key_task) )
2398 n->retry_set_key_task
2399 = GNUNET_SCHEDULER_add_delayed (sched,
2400 n->set_key_retry_frequency,
2401 &set_key_retry_task, n);
2406 * We received a SET_KEY message. Validate and update
2407 * our key material and status.
2409 * @param n the neighbour from which we received message m
2410 * @param m the set key message we received
2413 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m);
2417 * PEERINFO is giving us a HELLO for a peer. Add the public key to
2418 * the neighbour's struct and retry handling the set_key message. Or,
2419 * if we did not get a HELLO, just free the set key message.
2421 * @param cls pointer to the set key message
2422 * @param peer the peer for which this is the HELLO
2423 * @param hello HELLO message of that peer
2424 * @param trust amount of trust we currently have in that peer
2427 process_hello_retry_handle_set_key (void *cls,
2428 const struct GNUNET_PeerIdentity *peer,
2429 const struct GNUNET_HELLO_Message *hello,
2432 struct Neighbour *n = cls;
2433 struct SetKeyMessage *sm = n->skm;
2442 if (n->public_key != NULL)
2443 return; /* multiple HELLOs match!? */
2445 GNUNET_malloc (sizeof (struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded));
2446 if (GNUNET_OK != GNUNET_HELLO_get_key (hello, n->public_key))
2448 GNUNET_break_op (0);
2449 GNUNET_free (n->public_key);
2450 n->public_key = NULL;
2454 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2455 "Received `%s' for `%4s', continuing processing of `%s' message.\n",
2456 "HELLO", GNUNET_i2s (peer), "SET_KEY");
2458 handle_set_key (n, sm);
2463 * We received a PING message. Validate and transmit
2466 * @param n sender of the PING
2467 * @param m the encrypted PING message itself
2470 handle_ping (struct Neighbour *n, const struct PingMessage *m)
2472 struct PingMessage t;
2473 struct PongMessage tx;
2474 struct PongMessage *tp;
2475 struct MessageEntry *me;
2478 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2479 "Core service receives `%s' request from `%4s'.\n",
2480 "PING", GNUNET_i2s (&n->peer));
2484 &my_identity.hashPubKey,
2487 sizeof (struct PingMessage) -
2488 sizeof (struct GNUNET_MessageHeader)))
2491 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2492 "Decrypted `%s' to `%4s' with challenge %u decrypted using key %u\n",
2494 GNUNET_i2s (&t.target),
2495 ntohl (t.challenge), n->decrypt_key.crc32);
2496 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2497 "Target of `%s' request is `%4s'.\n",
2498 "PING", GNUNET_i2s (&t.target));
2500 if (0 != memcmp (&t.target,
2501 &my_identity, sizeof (struct GNUNET_PeerIdentity)))
2503 GNUNET_break_op (0);
2506 me = GNUNET_malloc (sizeof (struct MessageEntry) +
2507 sizeof (struct PongMessage));
2508 GNUNET_CONTAINER_DLL_insert_after (n->encrypted_head,
2512 me->deadline = GNUNET_TIME_relative_to_absolute (MAX_PONG_DELAY);
2513 me->priority = PONG_PRIORITY;
2514 me->size = sizeof (struct PongMessage);
2515 tx.reserved = htonl (0);
2516 tx.inbound_bw_limit = n->bw_in;
2517 tx.challenge = t.challenge;
2518 tx.target = t.target;
2519 tp = (struct PongMessage *) &me[1];
2520 tp->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_PONG);
2521 tp->header.size = htons (sizeof (struct PongMessage));
2523 &my_identity.hashPubKey,
2526 sizeof (struct PongMessage) -
2527 sizeof (struct GNUNET_MessageHeader));
2529 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2530 "Encrypting `%s' with challenge %u using key %u\n", "PONG",
2531 ntohl (t.challenge), n->encrypt_key.crc32);
2533 /* trigger queue processing */
2534 process_encrypted_neighbour_queue (n);
2539 * We received a PONG message. Validate and update our status.
2541 * @param n sender of the PONG
2542 * @param m the encrypted PONG message itself
2545 handle_pong (struct Neighbour *n,
2546 const struct PongMessage *m)
2548 struct PongMessage t;
2549 struct ConnectNotifyMessage cnm;
2552 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2553 "Core service receives `%s' request from `%4s'.\n",
2554 "PONG", GNUNET_i2s (&n->peer));
2558 &n->peer.hashPubKey,
2561 sizeof (struct PongMessage) -
2562 sizeof (struct GNUNET_MessageHeader)))
2564 if (0 != ntohl (t.reserved))
2566 GNUNET_break_op (0);
2570 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2571 "Decrypted `%s' from `%4s' with challenge %u using key %u\n",
2573 GNUNET_i2s (&t.target),
2574 ntohl (t.challenge), n->decrypt_key.crc32);
2576 if ((0 != memcmp (&t.target,
2578 sizeof (struct GNUNET_PeerIdentity))) ||
2579 (n->ping_challenge != ntohl (t.challenge)))
2581 /* PONG malformed */
2583 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2584 "Received malformed `%s' wanted sender `%4s' with challenge %u\n",
2585 "PONG", GNUNET_i2s (&n->peer), n->ping_challenge);
2586 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2587 "Received malformed `%s' received from `%4s' with challenge %u\n",
2588 "PONG", GNUNET_i2s (&t.target), ntohl (t.challenge));
2590 GNUNET_break_op (0);
2595 case PEER_STATE_DOWN:
2596 GNUNET_break (0); /* should be impossible */
2598 case PEER_STATE_KEY_SENT:
2599 GNUNET_break (0); /* should be impossible, how did we decrypt? */
2601 case PEER_STATE_KEY_RECEIVED:
2602 n->status = PEER_STATE_KEY_CONFIRMED;
2603 n->bw_out_external_limit = t.inbound_bw_limit;
2604 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
2605 n->bw_out_internal_limit);
2606 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
2609 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2610 "Confirmed key via `%s' message for peer `%4s'\n",
2611 "PONG", GNUNET_i2s (&n->peer));
2613 if (n->retry_set_key_task != GNUNET_SCHEDULER_NO_TASK)
2615 GNUNET_SCHEDULER_cancel (sched, n->retry_set_key_task);
2616 n->retry_set_key_task = GNUNET_SCHEDULER_NO_TASK;
2618 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
2619 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_CONNECT);
2620 cnm.distance = htonl (n->last_distance);
2621 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
2623 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_CONNECT);
2624 process_encrypted_neighbour_queue (n);
2626 case PEER_STATE_KEY_CONFIRMED:
2627 /* duplicate PONG? */
2637 * We received a SET_KEY message. Validate and update
2638 * our key material and status.
2640 * @param n the neighbour from which we received message m
2641 * @param m the set key message we received
2644 handle_set_key (struct Neighbour *n, const struct SetKeyMessage *m)
2646 struct SetKeyMessage *m_cpy;
2647 struct GNUNET_TIME_Absolute t;
2648 struct GNUNET_CRYPTO_AesSessionKey k;
2649 struct PingMessage *ping;
2650 struct PongMessage *pong;
2651 enum PeerStateMachine sender_status;
2654 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2655 "Core service receives `%s' request from `%4s'.\n",
2656 "SET_KEY", GNUNET_i2s (&n->peer));
2658 if (n->public_key == NULL)
2660 if (n->pitr != NULL)
2663 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2664 "Ignoring `%s' message due to lack of public key for peer (still trying to obtain one).\n",
2670 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2671 "Lacking public key for peer, trying to obtain one (handle_set_key).\n");
2673 m_cpy = GNUNET_malloc (sizeof (struct SetKeyMessage));
2674 memcpy (m_cpy, m, sizeof (struct SetKeyMessage));
2675 /* lookup n's public key, then try again */
2676 GNUNET_assert (n->skm == NULL);
2678 n->pitr = GNUNET_PEERINFO_iterate (cfg,
2682 GNUNET_TIME_UNIT_MINUTES,
2683 &process_hello_retry_handle_set_key, n);
2686 if (0 != memcmp (&m->target,
2688 sizeof (struct GNUNET_PeerIdentity)))
2690 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
2691 _("Received `%s' message that was not for me. Ignoring.\n"),
2695 if ((ntohl (m->purpose.size) !=
2696 sizeof (struct GNUNET_CRYPTO_RsaSignaturePurpose) +
2697 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
2698 sizeof (struct GNUNET_CRYPTO_RsaEncryptedData) +
2699 sizeof (struct GNUNET_PeerIdentity)) ||
2701 GNUNET_CRYPTO_rsa_verify (GNUNET_SIGNATURE_PURPOSE_SET_KEY,
2702 &m->purpose, &m->signature, n->public_key)))
2704 /* invalid signature */
2705 GNUNET_break_op (0);
2708 t = GNUNET_TIME_absolute_ntoh (m->creation_time);
2709 if (((n->status == PEER_STATE_KEY_RECEIVED) ||
2710 (n->status == PEER_STATE_KEY_CONFIRMED)) &&
2711 (t.value < n->decrypt_key_created.value))
2713 /* this could rarely happen due to massive re-ordering of
2714 messages on the network level, but is most likely either
2715 a bug or some adversary messing with us. Report. */
2716 GNUNET_break_op (0);
2720 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Decrypting key material.\n");
2722 if ((GNUNET_CRYPTO_rsa_decrypt (my_private_key,
2725 sizeof (struct GNUNET_CRYPTO_AesSessionKey))
2726 != sizeof (struct GNUNET_CRYPTO_AesSessionKey)) ||
2727 (GNUNET_OK != GNUNET_CRYPTO_aes_check_session_key (&k)))
2729 /* failed to decrypt !? */
2730 GNUNET_break_op (0);
2735 if (n->decrypt_key_created.value != t.value)
2737 /* fresh key, reset sequence numbers */
2738 n->last_sequence_number_received = 0;
2739 n->last_packets_bitmap = 0;
2740 n->decrypt_key_created = t;
2742 sender_status = (enum PeerStateMachine) ntohl (m->sender_status);
2745 case PEER_STATE_DOWN:
2746 n->status = PEER_STATE_KEY_RECEIVED;
2748 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2749 "Responding to `%s' with my own key.\n", "SET_KEY");
2753 case PEER_STATE_KEY_SENT:
2754 case PEER_STATE_KEY_RECEIVED:
2755 n->status = PEER_STATE_KEY_RECEIVED;
2756 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2757 (sender_status != PEER_STATE_KEY_CONFIRMED))
2760 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2761 "Responding to `%s' with my own key (other peer has status %u).\n",
2762 "SET_KEY", sender_status);
2767 case PEER_STATE_KEY_CONFIRMED:
2768 if ((sender_status != PEER_STATE_KEY_RECEIVED) &&
2769 (sender_status != PEER_STATE_KEY_CONFIRMED))
2772 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2773 "Responding to `%s' with my own key (other peer has status %u), I was already fully up.\n",
2774 "SET_KEY", sender_status);
2783 if (n->pending_ping != NULL)
2785 ping = n->pending_ping;
2786 n->pending_ping = NULL;
2787 handle_ping (n, ping);
2790 if (n->pending_pong != NULL)
2792 pong = n->pending_pong;
2793 n->pending_pong = NULL;
2794 handle_pong (n, pong);
2801 * Send a P2P message to a client.
2803 * @param sender who sent us the message?
2804 * @param client who should we give the message to?
2805 * @param m contains the message to transmit
2806 * @param msize number of bytes in buf to transmit
2809 send_p2p_message_to_client (struct Neighbour *sender,
2810 struct Client *client,
2811 const void *m, size_t msize)
2813 char buf[msize + sizeof (struct NotifyTrafficMessage)];
2814 struct NotifyTrafficMessage *ntm;
2817 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2818 "Core service passes message from `%4s' of type %u to client.\n",
2819 GNUNET_i2s(&sender->peer),
2820 ntohs (((const struct GNUNET_MessageHeader *) m)->type));
2822 ntm = (struct NotifyTrafficMessage *) buf;
2823 ntm->header.size = htons (msize + sizeof (struct NotifyTrafficMessage));
2824 ntm->header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_INBOUND);
2825 ntm->distance = htonl (sender->last_distance);
2826 ntm->latency = GNUNET_TIME_relative_hton (sender->last_latency);
2827 ntm->peer = sender->peer;
2828 memcpy (&ntm[1], m, msize);
2829 send_to_client (client, &ntm->header, GNUNET_YES);
2834 * Deliver P2P message to interested clients.
2836 * @param sender who sent us the message?
2837 * @param m the message
2838 * @param msize size of the message (including header)
2841 deliver_message (struct Neighbour *sender,
2842 const struct GNUNET_MessageHeader *m, size_t msize)
2844 struct Client *cpos;
2850 type = ntohs (m->type);
2852 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2853 "Received encapsulated message of type %u from `%4s'\n",
2855 GNUNET_i2s (&sender->peer));
2857 dropped = GNUNET_YES;
2859 while (cpos != NULL)
2861 deliver_full = GNUNET_NO;
2862 if (0 != (cpos->options & GNUNET_CORE_OPTION_SEND_FULL_INBOUND))
2863 deliver_full = GNUNET_YES;
2866 for (tpos = 0; tpos < cpos->tcnt; tpos++)
2868 if (type != cpos->types[tpos])
2870 deliver_full = GNUNET_YES;
2874 if (GNUNET_YES == deliver_full)
2876 send_p2p_message_to_client (sender, cpos, m, msize);
2877 dropped = GNUNET_NO;
2879 else if (cpos->options & GNUNET_CORE_OPTION_SEND_HDR_INBOUND)
2881 send_p2p_message_to_client (sender, cpos, m,
2882 sizeof (struct GNUNET_MessageHeader));
2886 if (dropped == GNUNET_YES)
2889 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2890 "Message of type %u from `%4s' not delivered to any client.\n",
2892 GNUNET_i2s (&sender->peer));
2894 /* FIXME: stats... */
2900 * Align P2P message and then deliver to interested clients.
2902 * @param sender who sent us the message?
2903 * @param buffer unaligned (!) buffer containing message
2904 * @param msize size of the message (including header)
2907 align_and_deliver (struct Neighbour *sender, const char *buffer, size_t msize)
2911 /* TODO: call to statistics? */
2912 memcpy (abuf, buffer, msize);
2913 deliver_message (sender, (const struct GNUNET_MessageHeader *) abuf, msize);
2918 * Deliver P2P messages to interested clients.
2920 * @param sender who sent us the message?
2921 * @param buffer buffer containing messages, can be modified
2922 * @param buffer_size size of the buffer (overall)
2923 * @param offset offset where messages in the buffer start
2926 deliver_messages (struct Neighbour *sender,
2927 const char *buffer, size_t buffer_size, size_t offset)
2929 struct GNUNET_MessageHeader *mhp;
2930 struct GNUNET_MessageHeader mh;
2934 while (offset + sizeof (struct GNUNET_MessageHeader) <= buffer_size)
2936 if (0 != offset % sizeof (uint16_t))
2938 /* outch, need to copy to access header */
2939 memcpy (&mh, &buffer[offset], sizeof (struct GNUNET_MessageHeader));
2944 /* can access header directly */
2945 mhp = (struct GNUNET_MessageHeader *) &buffer[offset];
2947 msize = ntohs (mhp->size);
2948 if (msize + offset > buffer_size)
2950 /* malformed message, header says it is larger than what
2951 would fit into the overall buffer */
2952 GNUNET_break_op (0);
2955 #if HAVE_UNALIGNED_64_ACCESS
2956 need_align = (0 != offset % 4) ? GNUNET_YES : GNUNET_NO;
2958 need_align = (0 != offset % 8) ? GNUNET_YES : GNUNET_NO;
2960 if (GNUNET_YES == need_align)
2961 align_and_deliver (sender, &buffer[offset], msize);
2963 deliver_message (sender,
2964 (const struct GNUNET_MessageHeader *)
2965 &buffer[offset], msize);
2972 * We received an encrypted message. Decrypt, validate and
2973 * pass on to the appropriate clients.
2976 handle_encrypted_message (struct Neighbour *n,
2977 const struct EncryptedMessage *m)
2979 size_t size = ntohs (m->header.size);
2981 struct EncryptedMessage *pt; /* plaintext */
2985 struct GNUNET_TIME_Absolute t;
2989 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
2990 "Core service receives `%s' request from `%4s'.\n",
2991 "ENCRYPTED_MESSAGE", GNUNET_i2s (&n->peer));
2993 GNUNET_CRYPTO_hash (&m->iv_seed, sizeof (uint32_t), &iv);
2999 &buf[ENCRYPTED_HEADER_SIZE],
3000 size - ENCRYPTED_HEADER_SIZE))
3002 pt = (struct EncryptedMessage *) buf;
3005 GNUNET_CRYPTO_hash (&pt->sequence_number,
3006 size - ENCRYPTED_HEADER_SIZE - sizeof (GNUNET_HashCode), &ph);
3007 if (0 != memcmp (&ph,
3008 &pt->plaintext_hash,
3009 sizeof (GNUNET_HashCode)))
3011 /* checksum failed */
3012 GNUNET_break_op (0);
3016 /* validate sequence number */
3017 snum = ntohl (pt->sequence_number);
3018 if (n->last_sequence_number_received == snum)
3020 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3021 "Received duplicate message, ignoring.\n");
3022 /* duplicate, ignore */
3025 if ((n->last_sequence_number_received > snum) &&
3026 (n->last_sequence_number_received - snum > 32))
3028 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3029 "Received ancient out of sequence message, ignoring.\n");
3030 /* ancient out of sequence, ignore */
3033 if (n->last_sequence_number_received > snum)
3035 unsigned int rotbit =
3036 1 << (n->last_sequence_number_received - snum - 1);
3037 if ((n->last_packets_bitmap & rotbit) != 0)
3039 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3040 "Received duplicate message, ignoring.\n");
3041 /* duplicate, ignore */
3044 n->last_packets_bitmap |= rotbit;
3046 if (n->last_sequence_number_received < snum)
3048 n->last_packets_bitmap <<= (snum - n->last_sequence_number_received);
3049 n->last_sequence_number_received = snum;
3052 /* check timestamp */
3053 t = GNUNET_TIME_absolute_ntoh (pt->timestamp);
3054 if (GNUNET_TIME_absolute_get_duration (t).value > MAX_MESSAGE_AGE.value)
3056 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3058 ("Message received far too old (%llu ms). Content ignored.\n"),
3059 GNUNET_TIME_absolute_get_duration (t).value);
3063 /* process decrypted message(s) */
3064 #if DEBUG_CORE_QUOTA
3065 if (n->bw_out_external_limit.value__ != pt->inbound_bw_limit.value__)
3066 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3067 "Received %u b/s as new inbound limit for peer `%4s'\n",
3068 (unsigned int) ntohl (pt->inbound_bw_limit.value__),
3069 GNUNET_i2s (&n->peer));
3071 n->bw_out_external_limit = pt->inbound_bw_limit;
3072 n->bw_out = GNUNET_BANDWIDTH_value_min (n->bw_out_external_limit,
3073 n->bw_out_internal_limit);
3074 GNUNET_BANDWIDTH_tracker_update_quota (&n->available_send_window,
3076 n->last_activity = GNUNET_TIME_absolute_get ();
3077 off = sizeof (struct EncryptedMessage);
3078 deliver_messages (n, buf, size, off);
3083 * Function called by the transport for each received message.
3085 * @param cls closure
3086 * @param peer (claimed) identity of the other peer
3087 * @param message the message
3088 * @param latency estimated latency for communicating with the
3089 * given peer (round-trip)
3090 * @param distance in overlay hops, as given by transport plugin
3093 handle_transport_receive (void *cls,
3094 const struct GNUNET_PeerIdentity *peer,
3095 const struct GNUNET_MessageHeader *message,
3096 struct GNUNET_TIME_Relative latency,
3097 unsigned int distance)
3099 struct Neighbour *n;
3100 struct GNUNET_TIME_Absolute now;
3106 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3107 "Received message of type %u from `%4s', demultiplexing.\n",
3108 ntohs (message->type), GNUNET_i2s (peer));
3110 n = find_neighbour (peer);
3112 n = create_neighbour (peer);
3115 n->last_latency = latency;
3116 n->last_distance = distance;
3117 up = (n->status == PEER_STATE_KEY_CONFIRMED);
3118 type = ntohs (message->type);
3119 size = ntohs (message->size);
3122 "Received message of type %u from `%4s'\n",
3128 case GNUNET_MESSAGE_TYPE_CORE_SET_KEY:
3129 if (size != sizeof (struct SetKeyMessage))
3131 GNUNET_break_op (0);
3134 handle_set_key (n, (const struct SetKeyMessage *) message);
3136 case GNUNET_MESSAGE_TYPE_CORE_ENCRYPTED_MESSAGE:
3137 if (size < sizeof (struct EncryptedMessage) +
3138 sizeof (struct GNUNET_MessageHeader))
3140 GNUNET_break_op (0);
3143 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3144 (n->status != PEER_STATE_KEY_CONFIRMED))
3146 GNUNET_break_op (0);
3149 handle_encrypted_message (n, (const struct EncryptedMessage *) message);
3151 case GNUNET_MESSAGE_TYPE_CORE_PING:
3152 if (size != sizeof (struct PingMessage))
3154 GNUNET_break_op (0);
3157 if ((n->status != PEER_STATE_KEY_RECEIVED) &&
3158 (n->status != PEER_STATE_KEY_CONFIRMED))
3161 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3162 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3163 "PING", GNUNET_i2s (&n->peer));
3165 GNUNET_free_non_null (n->pending_ping);
3166 n->pending_ping = GNUNET_malloc (sizeof (struct PingMessage));
3167 memcpy (n->pending_ping, message, sizeof (struct PingMessage));
3170 handle_ping (n, (const struct PingMessage *) message);
3172 case GNUNET_MESSAGE_TYPE_CORE_PONG:
3173 if (size != sizeof (struct PongMessage))
3175 GNUNET_break_op (0);
3178 if ( (n->status != PEER_STATE_KEY_RECEIVED) &&
3179 (n->status != PEER_STATE_KEY_CONFIRMED) )
3182 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3183 "Core service receives `%s' request from `%4s' but have not processed key; marking as pending.\n",
3184 "PONG", GNUNET_i2s (&n->peer));
3186 GNUNET_free_non_null (n->pending_pong);
3187 n->pending_pong = GNUNET_malloc (sizeof (struct PongMessage));
3188 memcpy (n->pending_pong, message, sizeof (struct PongMessage));
3191 handle_pong (n, (const struct PongMessage *) message);
3194 GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
3195 _("Unsupported message of type %u received.\n"), type);
3198 if (n->status == PEER_STATE_KEY_CONFIRMED)
3200 now = GNUNET_TIME_absolute_get ();
3201 n->last_activity = now;
3203 n->time_established = now;
3209 * Function that recalculates the bandwidth quota for the
3210 * given neighbour and transmits it to the transport service.
3212 * @param cls neighbour for the quota update
3216 neighbour_quota_update (void *cls,
3217 const struct GNUNET_SCHEDULER_TaskContext *tc)
3219 struct Neighbour *n = cls;
3220 struct GNUNET_BANDWIDTH_Value32NBO q_in;
3223 unsigned long long distributable;
3224 uint64_t need_per_peer;
3225 uint64_t need_per_second;
3227 n->quota_update_task = GNUNET_SCHEDULER_NO_TASK;
3228 /* calculate relative preference among all neighbours;
3229 divides by a bit more to avoid division by zero AND to
3230 account for possibility of new neighbours joining any time
3231 AND to convert to double... */
3232 if (preference_sum == 0)
3234 pref_rel = 1.0 / (double) neighbour_count;
3238 pref_rel = n->current_preference / preference_sum;
3240 need_per_peer = GNUNET_BANDWIDTH_value_get_available_until (MIN_BANDWIDTH_PER_PEER,
3241 GNUNET_TIME_UNIT_SECONDS);
3242 need_per_second = need_per_peer * neighbour_count;
3244 if (bandwidth_target_out_bps > need_per_second)
3245 distributable = bandwidth_target_out_bps - need_per_second;
3246 share = distributable * pref_rel;
3247 if (share + need_per_peer > ( (uint32_t)-1))
3248 q_in = GNUNET_BANDWIDTH_value_init ((uint32_t) -1);
3250 q_in = GNUNET_BANDWIDTH_value_init (need_per_peer + (uint32_t) share);
3251 /* check if we want to disconnect for good due to inactivity */
3252 if ( (GNUNET_TIME_absolute_get_duration (n->last_activity).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) &&
3253 (GNUNET_TIME_absolute_get_duration (n->time_established).value > GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT.value) )
3256 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3257 "Forcing disconnect of `%4s' due to inactivity (?).\n",
3258 GNUNET_i2s (&n->peer));
3260 q_in = GNUNET_BANDWIDTH_value_init (0); /* force disconnect */
3262 #if DEBUG_CORE_QUOTA
3263 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3264 "Current quota for `%4s' is %u/%llu b/s in (old: %u b/s) / %u out (%u internal)\n",
3265 GNUNET_i2s (&n->peer),
3266 (unsigned int) ntohl (q_in.value__),
3267 bandwidth_target_out_bps,
3268 (unsigned int) ntohl (n->bw_in.value__),
3269 (unsigned int) ntohl (n->bw_out.value__),
3270 (unsigned int) ntohl (n->bw_out_internal_limit.value__));
3272 if (n->bw_in.value__ != q_in.value__)
3275 GNUNET_TRANSPORT_set_quota (transport,
3279 GNUNET_TIME_UNIT_FOREVER_REL,
3282 schedule_quota_update (n);
3287 * Function called by transport to notify us that
3288 * a peer connected to us (on the network level).
3290 * @param cls closure
3291 * @param peer the peer that connected
3292 * @param latency current latency of the connection
3293 * @param distance in overlay hops, as given by transport plugin
3296 handle_transport_notify_connect (void *cls,
3297 const struct GNUNET_PeerIdentity *peer,
3298 struct GNUNET_TIME_Relative latency,
3299 unsigned int distance)
3301 struct Neighbour *n;
3302 struct GNUNET_TIME_Absolute now;
3303 struct ConnectNotifyMessage cnm;
3305 n = find_neighbour (peer);
3308 if (n->is_connected)
3310 /* duplicate connect notification!? */
3317 n = create_neighbour (peer);
3319 now = GNUNET_TIME_absolute_get ();
3320 n->is_connected = GNUNET_YES;
3321 n->last_latency = latency;
3322 n->last_distance = distance;
3323 GNUNET_BANDWIDTH_tracker_init (&n->available_send_window,
3326 GNUNET_BANDWIDTH_tracker_init (&n->available_recv_window,
3330 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3331 "Received connection from `%4s'.\n",
3332 GNUNET_i2s (&n->peer));
3334 cnm.header.size = htons (sizeof (struct ConnectNotifyMessage));
3335 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_PRE_CONNECT);
3336 cnm.distance = htonl (n->last_distance);
3337 cnm.latency = GNUNET_TIME_relative_hton (n->last_latency);
3339 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_PRE_CONNECT);
3345 * Function called by transport telling us that a peer
3348 * @param cls closure
3349 * @param peer the peer that disconnected
3352 handle_transport_notify_disconnect (void *cls,
3353 const struct GNUNET_PeerIdentity *peer)
3355 struct DisconnectNotifyMessage cnm;
3356 struct Neighbour *n;
3359 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3360 "Peer `%4s' disconnected from us.\n", GNUNET_i2s (peer));
3362 n = find_neighbour (peer);
3368 GNUNET_break (n->is_connected);
3369 cnm.header.size = htons (sizeof (struct DisconnectNotifyMessage));
3370 cnm.header.type = htons (GNUNET_MESSAGE_TYPE_CORE_NOTIFY_DISCONNECT);
3372 send_to_all_clients (&cnm.header, GNUNET_YES, GNUNET_CORE_OPTION_SEND_DISCONNECT);
3373 n->is_connected = GNUNET_NO;
3378 * Last task run during shutdown. Disconnects us from
3382 cleaning_task (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3384 struct Neighbour *n;
3388 GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
3389 "Core service shutting down.\n");
3391 GNUNET_assert (transport != NULL);
3392 GNUNET_TRANSPORT_disconnect (transport);
3394 while (NULL != (n = neighbours))
3396 neighbours = n->next;
3397 GNUNET_assert (neighbour_count > 0);
3401 GNUNET_SERVER_notification_context_destroy (notifier);
3403 while (NULL != (c = clients))
3404 handle_client_disconnect (NULL, c->client_handle);
3405 if (my_private_key != NULL)
3406 GNUNET_CRYPTO_rsa_key_free (my_private_key);
3411 * Initiate core service.
3413 * @param cls closure
3414 * @param s scheduler to use
3415 * @param serv the initialized server
3416 * @param c configuration to use
3420 struct GNUNET_SCHEDULER_Handle *s,
3421 struct GNUNET_SERVER_Handle *serv,
3422 const struct GNUNET_CONFIGURATION_Handle *c)
3428 /* parse configuration */
3431 GNUNET_CONFIGURATION_get_value_number (c,
3434 &bandwidth_target_in_bps)) ||
3436 GNUNET_CONFIGURATION_get_value_number (c,
3439 &bandwidth_target_out_bps)) ||
3441 GNUNET_CONFIGURATION_get_value_filename (c,
3443 "HOSTKEY", &keyfile)))
3445 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3447 ("Core service is lacking key configuration settings. Exiting.\n"));
3448 GNUNET_SCHEDULER_shutdown (s);
3451 my_private_key = GNUNET_CRYPTO_rsa_key_create_from_file (keyfile);
3452 GNUNET_free (keyfile);
3453 if (my_private_key == NULL)
3455 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
3456 _("Core service could not access hostkey. Exiting.\n"));
3457 GNUNET_SCHEDULER_shutdown (s);
3460 GNUNET_CRYPTO_rsa_key_get_public (my_private_key, &my_public_key);
3461 GNUNET_CRYPTO_hash (&my_public_key,
3462 sizeof (my_public_key), &my_identity.hashPubKey);
3463 /* setup notification */
3465 notifier = GNUNET_SERVER_notification_context_create (server,
3467 GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
3468 /* setup transport connection */
3469 transport = GNUNET_TRANSPORT_connect (sched,
3472 &handle_transport_receive,
3473 &handle_transport_notify_connect,
3474 &handle_transport_notify_disconnect);
3475 GNUNET_assert (NULL != transport);
3476 GNUNET_SCHEDULER_add_delayed (sched,
3477 GNUNET_TIME_UNIT_FOREVER_REL,
3478 &cleaning_task, NULL);
3479 /* process client requests */
3480 GNUNET_SERVER_add_handlers (server, handlers);
3481 GNUNET_log (GNUNET_ERROR_TYPE_INFO,
3482 _("Core service of `%4s' ready.\n"), GNUNET_i2s (&my_identity));
3488 * The main function for the transport service.
3490 * @param argc number of arguments from the command line
3491 * @param argv command line arguments
3492 * @return 0 ok, 1 on error
3495 main (int argc, char *const *argv)
3497 return (GNUNET_OK ==
3498 GNUNET_SERVICE_run (argc,
3501 GNUNET_SERVICE_OPTION_NONE,
3502 &run, NULL)) ? 0 : 1;
3505 /* end of gnunet-service-core.c */